You may put a +1/+1 counter on a creature. Then choose odd or even. Return each creature with power of the chosen quality to its owner’s hand. (Zero is even.)
"There exists a theoretical infinity between the discrete atoms of reality. I'm simply appropriating that infinity as storage space."
You choose odd or even while Zimone's Hypothesis is resolving. Players can't take any actions between the time you make that choice and the time creatures are returned to their owners' hands.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.